Dobby mechanism for leno-weaving.



No. 861,945. PATENTED JULY 30, 1907.

I J. B. BOLTON.

DOBBY MECHANISM FOR LENO WEAVING. APPLICATION FILED 001211, 1008.

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J. B. BOLTON.

DOBBY MECHANISM FOR LENO WE AVING.

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I anvqnl'o'n L171 UNITED STATES PATENT OFFICE.

JOHN B. BOLTON, OF NEW BEDFORD, MASSACHUSETTS, ASSIGNOR TO DRAPERCOMPANY,

' OF I-IOPEDALE, MASSACHUSETTS, A CORPORATION.

DOBBY MECHANISM FOR LENO-WEAVING.

Specification of Letters Patent.

Patented July so, 1907.

Application filed October 17,1906. Serial No. 339,881.

To all whom it may concern:

Be it known that I, JOHN B. BOLTON, a citizen of the United States,residing at New Bediford, in the county of Bristol and the State ofMassachusetts, have invented a-new and useful lmprovement in DobbyMechanism for Leno-Weaving, of which the following is a specification.

This invention relates to a loom attachment and comprises a two partjack, half of which continues the full length of the throw while theother half returns.

One of the objects of the invention is to obtain the requisite half andreturn motion without the aid of gears and cranks.

A further object of my invention is a device that will also weave a lenotop warp.

My invention consists in the novel features of construction andcombination of parts hereinafter described, particularly pointed out inthe claims and shown in the accompanying drawings, in which:

Figure 1 is an elevation showing attached to a loom my improvement,certain positions of the lever being shown in dotted lines. Fig. 2 is adetail view, in elevation, of my improvement, detached. Fig. 3 is aperspective view of the jack. Fig. 4 is a perspective detail view of alink, and, Fig. 5 is a perspective view of a trip segment.

In these drawings A represents the dobby frame of a loom having myimproved leno motion attached there to. From a suitable harness frame Ba cord B extends over a pulley B'-.and is connected to the harness leverO by means of the usual form of loop O. My improved jack is shown indetail in Fig. 3 and comprises the bar D having formed thereon on oneside, and intermediate its ends a Web D. A circular boss D is formed onthe bar or jack D and also extends over the web D, intermediate the endsof the same, the boss being situated equi-distant from the ends of thejack D. The boss D is provided with a suitable bore D into whichprojects a suitable stud from the harness lever G, to which the jack maybe pinned or held in any suitable manner. The jack is provided withperforations, D D above and below the boss D and the web D is alsoperforated as shown at D. I further provide two link arms E, identicalin construction, perforated adjacent each end, and also perforatedadjacent the lower end, the end perforations being shown at E and thethird perforation being shown at E These arms are placed in reverseposition, one of them being pivotally connected to the web D above theboss D and the other arm having an end pivotally connected to the web Dbelow the boss D Curved segments F pivotally connect the arms E to thejack D, one end of the segments being pivoted directly to the jack, thepivot pins fitting in the perforations D D and the outer ends of thesegments F are pivotally connected to short links F which in turn havetheir other ends pivotally connected to the respective link arms E at EAs stated above the arms are arranged in a reverse position so that thelink F is pivoted to the lower of the arms E at a greater distance fromthe pivotal connection of that arm to the web D, than the pivotal pointE and the pivotal point of the web D on the upper arm E. Each of thesegments F has formed thereon an angular projection F adapted to beengaged by a fixed, spring tripping finger G. A flat, compound curvedspring H is arranged substantially parallel to the web D andintermediate its ends bears on the boss D while the ends of the springbear on the upper arm E adjacent the pivotal connection of that arm andthe link F, and the opposite end of the spring H bears on the arm Ebelow the boss D adjacent the pivotal point of that arm and the web D.

In Fig. 1 I have shown two dotted positions numbered respectively 1 and2, said positions beingtaken by the harness lever, position 1 being theposition occupied by the lever with the ordinary jack, and the full lineposition and dotted position number 2 being the positions taken by thesaid lever with my improved form of jack.

The ends of the arms E, opposite the ends pivotally connected to the webD, are connected to the usual hook members K. In this construction thereciprocating movement of the hooks-are imparted to the jack through themedium of the link arms E. At the end of the half movement the trippingfinger G is disengaged from the segment, the action of the two fingersbeing the same, and the jack is permitted to divide as a whole, the armconnected to the hook K continuing out the full length of the throw,while the bar D forming the jack proper reverses its movement andreturns. It will be understood that the arms E are parts of the jack,and are locked to the jack bar D, as shown in the lower portion of Fig.2, when the tripper finger G is in engagement with the projection F Itwill be understood that the free hook end of the tripping finger G, isalways in engagement with its segment F and rides upon the projection Fwhich lifts the tripping finger, there being as above stated, a separatefinger for each of the segments.

Having thus fully described my invention what I claim as new and desireto secure by Letters Patent is: 1. In a dobby mechanism adapted for lenoweaving, the jack, the link arms pivotally connected thereto, means fornormally pressing the links to the jack curved segments pivotallyconnected to the jack, and links pivotally connecting the segments tothe link arms.

2. In a dobby mechanism adapted for leno weaving a jack, link armspivotally connected thereto, segments pivotally connected to the jack,links pivotally connecting the segments and the link arms, means forlocking the arm to curved segments having projections formed thereon andthe jack during the first half of the jack movement, and a springadapted to engage the link arms, as and for the purpose set forth.

3. A loom attachment of the kind described comprising a jack, pivotedarms carried thereby, segments carried by the jack and having angularprojections, tripping fingers adapted to engage said projections througha portion of the travel of the segments, links connecting the segmentsand the arms, and a spring hearing at its ends on the arms, as and forthe purpose specified.

4. In a (lobby mechanism adapted for leno weaving a jack, link armspivoted thereto, hooks pivoted to the arms,

pivoted to the jack, a link connecting one segment to one arm adjacentthe pivotal point of the arm to the jack, a link connecting the othersegment to the remaining arm adjacent the pivotal point of the said armand its hook member, tripping fingers adapted to engage the projectionson the segments, and a spring adapted to engage the link arms,substantially as set forth.

JOHN B. BOLTON.

Witnesses:

WILLIAM F. HOWE, Ronmvr HUGHES.

